But i get this error : [Fri Sep 01 13:17:33.014307 2017] [ssl:warn] [pid 5464:tid 544] AH: Init: (mch44.fr:443) disabling this host for now as certificate/key data for the Managed Domain is incomplete.

I have mod_ssl, mod_md and mod_watchdog active.
Can you help me to make it working ?

Ok, after MAAAAANYYYY tests/try...
It work, but i don't know why ^^
And if i reboot the web server, it don't work again

Settings for mod_md are :

Code:

# Container for directives applied to the same managed domains
MDCertificateAgreement https://letsencrypt.org/documents/LE-SA-v1.1.1-August-1-2016.pdf

# This tells mod_md which challenge types it shall use in which order when proving domain ownership. The names are protocol specific. The current ACME protocol version that Let's Encrypt speaks defines two challenge types that are supported by mod_md. By default, it will try the one on port 443 when available
# Default: MDCAChallenges tls-sni-01 http-01
MDCAChallenges http-01